(5/7)+(1/8)+(3/8)+(2/7)简便计算 6.4X101简便计算
问题描述：
(5/7)+(1/8)+(3/8)+(2/7)简便计算 6.4X101简便计算
答
(5/7)+(1/8)+(3/8)+(2/7)
=[(5/7)+(2/7)]+[(1/8)+(3/8)]
=1+(1/2)
=3/2
6.4X101
=6.4X(100+1)
=6.4X100+6.4X1
=640+6.4
=646.4
答
(5/7)+(1/8)+(3/8)+(2/7)
=(5/7+2/7)+(1/8+3/8)
=1+1/2
=1又1/2
6.4X101
=6.4*（100+1）
=6.4*100+6.4*1
=640+6.4
=646.4
答
1、=5/7+2/7+(1/8+3/8)
=1+1/2
=1又1/2
2、=6.4×(100+1)
=6.4×100+6.4×1
=640+6.4
=646.4